灰色不规则多晶体，强度较差，其特点自锐性良好，可以始终是制品保持锋利的切削刃，常用于金属、陶瓷结合剂工具、磨具、砂轮等。
Gray and irregular polycrystal, low strength. The features are good self-sharpening. It can be always the cutting edge to keep products sharp and often used in metal, ceramic bond tool, abrasive tool, abrasive wheel etc.
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